|Mission type||Earth science|
|Mission duration||Failed to orbit|
|Manufacturer||Jet Propulsion Laboratory|
|Launch mass||15.70 kilograms (34.6 lb)|
|Start of mission|
|Launch date||March 23, 1958, 00:00UTC|
|Launch site||Cape Canaveral LC-26B|
It launched atop a Juno II rocket on March 23, 1960 from Launch Complex 26, but failed when the rocket's first stage collided with its second stage after separation, causing the upper stage firing angle to be off.